Attack of the Crab Monsters

Richard Garland

as Dale Drewer

Pamela Duncan

as Dr. Martha 'Marti' Hunter

Russell Johnson

as Hank Chapman

Leslie Bradley

as Dr. Karl Weigand

Mel Welles

as Jules Deveroux

Richard H. Cutting

as Dr. James Carson

Beach Dickerson

as Seaman Ron Fellows

Tony Miller

as Seaman Jack Sommers

Ed Nelson

as Ensign Quinlan

Charles B. Griffith

as Seaman Mac, wears sunglasses

Maitland Stuart

as Diving-double for male cast

Robin Riley

as Diving-double for Pamela Duncan